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Emergence of distinct electronic states in epitaxially-fused PbSe quantum dot superlattices

Author

Listed:
  • Mahmut S. Kavrik

    (Lawrence Berkeley National Laboratory
    University of California)

  • Jordan A. Hachtel

    (Center for Nanophase Materials Sciences, Oak Ridge National Laboratory)

  • Wonhee Ko

    (Center for Nanophase Materials Sciences, Oak Ridge National Laboratory)

  • Caroline Qian

    (University of California)

  • Alex Abelson

    (University of California)

  • Eyup B. Unlu

    (University of California)

  • Harshil Kashyap

    (University of California)

  • An-Ping Li

    (Center for Nanophase Materials Sciences, Oak Ridge National Laboratory)

  • Juan C. Idrobo

    (University of Washington)

  • Matt Law

    (University of California
    University of California
    University of California)

Abstract

Quantum coupling in arrayed nanostructures can produce novel mesoscale properties such as electronic minibands to improve the performance of optoelectronic devices, including ultra-efficient solar cells and infrared photodetectors. Colloidal PbSe quantum dots (QDs) that self-assemble into epitaxially-fused superlattices (epi-SLs) are predicted to exhibit such collective phenomena. Here, we show the emergence of distinct local electronic states induced by crystalline necks that connect individual PbSe QDs and modulate the bandgap energy across the epi-SL. Multi-probe scanning tunneling spectroscopy shows bandgap modulation from 0.7 eV in the QDs to 1.1 eV at their necks. Complementary monochromated electron energy-loss spectroscopy demonstrates bandgap modulation in spectral mapping, confirming the presence of these distinct energy states from necking. The results show the modification of the electronic structure of a precision-made nanoscale superlattice, which may be leveraged in new optoelectronic applications.

Suggested Citation

  • Mahmut S. Kavrik & Jordan A. Hachtel & Wonhee Ko & Caroline Qian & Alex Abelson & Eyup B. Unlu & Harshil Kashyap & An-Ping Li & Juan C. Idrobo & Matt Law, 2022. "Emergence of distinct electronic states in epitaxially-fused PbSe quantum dot superlattices," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33955-w
    DOI: 10.1038/s41467-022-33955-w
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    References listed on IDEAS

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    1. Uri Banin & YunWei Cao & David Katz & Oded Millo, 1999. "Identification of atomic-like electronic states in indium arsenide nanocrystal quantum dots," Nature, Nature, vol. 400(6744), pages 542-544, August.
    2. Marek Kolmer & Pedro Brandimarte & Jakub Lis & Rafal Zuzak & Szymon Godlewski & Hiroyo Kawai & Aran Garcia-Lekue & Nicolas Lorente & Thomas Frederiksen & Christian Joachim & Daniel Sanchez-Portal & Ma, 2019. "Electronic transport in planar atomic-scale structures measured by two-probe scanning tunneling spectroscopy," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
    3. Eric R. Hoglund & De-Liang Bao & Andrew O’Hara & Sara Makarem & Zachary T. Piontkowski & Joseph R. Matson & Ajay K. Yadav & Ryan C. Haislmaier & Roman Engel-Herbert & Jon F. Ihlefeld & Jayakanth Ravic, 2022. "Emergent interface vibrational structure of oxide superlattices," Nature, Nature, vol. 601(7894), pages 556-561, January.
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